| Autor: |
Astuti, Widi, Sulistyaningsih, Triastuti, Selvia Fardhyanti, Dewi |
| Zdroj: |
Advanced Materials Research; April 2015, Vol. 1101 Issue: 1 p149-152, 4p |
| Abstrakt: |
The major problem in coal-based thermal power plants is related to solid waste called coal fly ash (CFA). CFA is mainly composed of some oxides including SiO2, Al2O3 having active site and unburned carbon as a mesopore that enables it to act as a dual site adsorbent for heavy metals including Cr (VI). To get different characters of dual site, CFA was treated by sulfuric acid (H2SO4) at different concentrations, temperatures and reaction time. Furthermore, treated CFA were used as an adsorbent to adsorb Cr (VI) in aqueous solutions. Equilibrium data were evaluated by single site and dual site isotherm models. It can be concluded, although unburned carbon contributes on the Cr (VI) adsorption, the existence of unburned carbon decreases the amount of Cr (VI) adsorbed because unburned carbon can plug active sites where dominant adsorption occurs. However, dual site isotherm model yielded excellent fit with equilibrium data. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
